Its an unimportant plugin. It shows a little foot in each tiddler with the tiddlers tagged with the current tiddler and with the tasg of the current tiddler to navigate down and up:
-- You received this message because you are subscribed to the Google Groups "TiddlyWiki" group. To unsubscribe from this group and stop receiving emails from it, send an email to tiddlywiki+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/tiddlywiki/ac2ca1cd-124f-4408-9cd0-f4c766f00bfb%40googlegroups.com.